Veselin Topalov is a Bulgarian Grandmaster born in 1975.He played in the FIDE 1998,1999,2000,2002,2004 and finally winning the 2005 tournament scoring 6,5 out of 7 points in the first half of it. In the controversial 2006 reunification match against Kramnik he narrowly lost in tie breaks.
By defeating Gata Kamsky in matchplay 4,5 to 2,5 he gained the right to play Anand in the 2010 World Championship.
He won several super tournaments including Linares, MTL Masters and Corus.
He was ranked number one for 27 months.
Gata Kamsky is an American Grandmaster born in 1974. He jointly won the 1987 Chess Junior Championship in 1987 and 1988.
He won 3 U.S. Championships.
From 1996 to 2004 he stopped competing to focus on his medical and later law degree, after his comeback he achieved his peak rating of 2745.
The first big upset of the 2011 Candidates Tournament saw Kamsky play a brilliant game.